Capsicum annuum var. annuum (Longum Group) 'Diablo'

RHS Plant Profile
sweet pepper 'Diablo'

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Annual Biennial

A high yielding, ox horn sweet pepper variety producing attractive, smooth skinned, long, pointed, glossy, ruby red fruits that can grow up to 16cm in length. The flesh is crunchy and sweet. Harvest between July and October

Position

Full sun

Soil Types

Loam, Sand

Max Height

0.5-1 metres

Max Spread

0.1-0.5 metres

Size

Time to Maturity
1 year
Max Spread
0.1-0.5 metres
Max Height
0.5-1 metres

Growing Conditions

Loam Sand
Moisture
Moist but well–drained or Well–drained
pH
Neutral or Acid

Position

Full sun
Aspect
South–facing or West–facing
Exposure
Sheltered
Hardiness

Hardiness Ratings

All ratings refer to the UK growing conditions unless otherwise stated. Minimum temperature ranges (in degrees C) are shown in brackets

  • H1A: under glass all year (>15C)
  • H1B: can be grown outside in the summer (10 - 15)
  • H1C: can be grown outside in the summer (5 - 10)
  • H2: tolerant of low temperatures, but not surviving being frozen (1 to 5)
  • H3: hardy in coastal and relatively mild parts of the UK (-5 to 1)
  • H4: hardy through most of the UK (-10 to -5)
  • H5: hardy in most places throughout the UK even in severe winters (-15 to -10)
  • H6: hardy in all of UK and northern Europe (-20 to -15)
  • H7: hardy in the severest European continental climates (< -20)
H1C

Colour & Scent

Season Stem Flower Foliage Fruit
Spring
Summer
Autumn
Winter

Botanical Details

Family
Solanaceae
Native to GB/Ireland
No
Foliage
Deciduous
Habit
Columnar upright
Genus
Capsicum are annual or perennial plants, with simple, alternate leaves, and tubular or bell-shaped flowers. They are grown for their glossy, many-seeded edible fruits, including chilli and bell peppers, and as indoor ornamental plants
Name Status
Accepted

How to Grow

Cultivation

Sow indoors from mid-February to early April in small pots filled with good quality seed compost and maintain a constant temperature of 25C. Transplant seedlings into individual pots when two true leaves have formed and grow on in a sunny, sheltered spot. Stake to keep plants upright. Water regularly and feed with a high potash liquid fertiliser once the first fruit has set. See vegetable cultivation

Propagation

Propagate by seed. See sowing vegetable seeds or sowing seeds indoors for further advice

Suggested planting locations and garden types

  • Patio and container plants
  • Conservatory and greenhouse

Pruning

Pinch out growing tips to encourage branching

Pests

May be susceptible to aphids, glasshouse whitefly, glasshouse red spider mite

Diseases

May be susceptible to grey moulds and blossom end rot. Shows resistance to tobacco mosaic virus (TMV)